Web Reference: Dec 3, 2025 · One important lifecycle method for cleaning up resources and side effects is componentWillUnmount (). This method is called just before a component is removed from the DOM, making it an essential tool for avoiding memory leaks and ensuring proper resource management. The next phase in the lifecycle is when a component is removed from the DOM, or unmounting as React likes to call it. React has only one built-in method that gets called when a component is unmounted: Nov 23, 2016 · From the official tutorial: componentWillUnmount() is invoked immediately before a component is unmounted and destroyed. Perform any necessary cleanup in this method, such as invalidating timers, canceling network requests, or cleaning up any DOM elements that were created in componentDidMount.
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